Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken-line lettering of FIG. 2 is environmental only and forms no part of the claimed design. 

The ornamental design for a clock, as shown and described. 